User Manual For - CONTROLLER/DATA RECORDER MultiCon CMC-N16
HOLDING
registers can be set as
read
or
read and write
. That is why when
the
Block type
parameter is set as
read HOLDING reg.
, in this block, registers are
read
type. When this block is set as
write HOLDING reg.
, in this block, register are
read and write
type.
7.15.2.3.
Modbus SLAVE - The Modbus protocol handling
Parameters for Modbus RTU implemented in MultiCon
Transmission parameters:
1 start bit, 8 data bits, 1/2 stop bit, no/even/odd parity control
Baud rate:
selectable from: 1200 to 115200 bits/second
Transmission protocol:
MODBUS RTU compatible
7.15.2.4.
Modbus SLAVE - List of registers
The device parameters and measurement result are available via the RS-485 interface,
as HOLDING and INPUT type registers of Modbus RTU protocol and via Ethernet interface as
HOLDING and INPUT type registers of MODBUS TPC/IP. The registers (or groups of the
registers) can be read by 04h function when a register is set as INPUT type or by 03h function
when a register is set as HOLDING type. HOLDING type registers can be written by 06h
(single registers) or 10h (group of the registers) accordingly to the Modbus RTU and TCP/IP
specification.
Register Write
Range
Register description
20h
No
0÷255
Address of device
21h
No
2050h, 2040h
Device identification code
2050h
- device in big housing (5.7” display),
- device in small housing (3.5” display).
Measurements results (floating point format)
1
200h
Yes
0÷0FFFFh
Measurement result for logical channel 1 (high word)
201h
Yes
0÷0FFFFh
Measurement result for logical channel 1 (low word)
202h
Yes
0÷0FFFFh
Status for logical channel 1:
0h
- data valid,
1h
- data not ready,
20h
- software error,
40h
- bottom border of the software measurement range is
exceeded,
80h
- top border of the software measurement range is exceeded,
2000h
- hardware error,
4000h
- bottom border of the hardware measurement range is
exceeded,
8000h
- top border of the hardware measurement range is
exceeded,
FFFFh
- data not available (e.g. logical channel not configured)
203h
Yes
0÷4
Decimal point for logical channel 1
230
i